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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bab1176fb252a1de3f7efe4fcd6841b7b755e3f0b05f9a6c80f5a2939389a0b1' 
  AND token = 'hZe4vxe9mlIWCC31f1T0qVnWrU27xg+x0+zOhaph6TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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