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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abb32ae21ed0e1751c98ca2fd124611d8d7d893560c62ba71a5331ddf932eec6' 
  AND token = 'zzqGM2AklNEoT9SDNOrIgRd5D5V6AND8ZxVP+7PlSXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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