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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f219c3c206e9049be0491db61f913c0af739c2723abb14f4df325ac43d2b813' 
  AND token = 'FiMv15fz9tSU75SjLeEDT+tUnygMJrkXzvqE7qE4HLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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