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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3468dc37c127972be946a7839cebe3492e43f81e323da7781bc9ec2c3b0466f1' 
  AND token = 'svKiQ5cmpSYPOjAj24pLIXs3Z3Cx1EBT0kNKqW0GaGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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