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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599bc9680606cbc52e4e9739de59954178a468642ce75282bf5b23091e7b103a' 
  AND token = 'vvvsQx3e42+UWFOT5wVOmXP03pgFTRlsCDkBCiLow8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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