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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc8cddebdf9c262e25229d476c39d1a212d022b4dad17891ef1beca522459c06' 
  AND token = 'UYcrwIwD3A+E2hhuUv9M/i8ATzD/MhUHEPW5d/l3PFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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