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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '312f44fe26b5bfdea76b1e54fcf1d1f90312999cc1a971328e8878e89512e6e2' 
  AND token = 'DYMxJAJtlszyX7TPleL1V7lCBGOuk7MtEcFfT7G1I2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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