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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c42ea4c0b424e10e478ec5b1db2d312841748b6f5d197ec07371901f013a032f' 
  AND token = '5DZTRNgDu1XzPQeM6CNkG38Pl79RpBltKdm7v+Z9uPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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