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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '187a5d96b18f4760620d0c1570b89e90fafde663d47c72018c2564dc737979be' 
  AND token = 'AAbRRrr3Il5QeDYBW8pVVl+rjxyQtO8zzDjuO5o+8R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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