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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3ea86497c18817ce34e5936aac2237a1f6a261a41e401c4ccd43e5e89fab112' 
  AND token = 'lTzAer6gewi9KJUf4CFS9pOMr7kGYOni6GbnoAhbkAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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