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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '960755363bd9d4a6c64996feb3d0e30bcbc3b5dc8000a8d37eaa06813ceb9c28' 
  AND token = 'zHS4fDN4azXQM1Ge1q1r/1hIRTGdC5CCWDdJd5vc87A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}