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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abbf8b6f805081f319f9ce17f6aaab1fece053ecbdfcdedc55a5938630a74330' 
  AND token = '7lEA3HrMCMbPeY4BsC/M+elCxoiMUlerghQomh0uvnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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