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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1c5aedaf59a63dfd41b6101efbcc6b2fd77fc39624a839ad1848cda118b13be' 
  AND token = '2qVORo2iQRkCQF5mng4i5UwQYWP2LGck/g3TqQl4ZuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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