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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '285b0f255f22256be01cf3bd053d45dbad01d4e3846942d5ef9264c85f4a04b3' 
  AND token = 'VcFPXSv0u3rAruHyImvdB9KL4hIoeqqPM9T39zVqaTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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