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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a5ca6810e606622e0bc0cbbb8616d1cdef955e340c3249133a9a28236d17e3c' 
  AND token = 'vREd2Jo2Sy4DfGiF18M99ZRNInoQTLfC6iWI55SVy8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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