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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1136cd1e680fb9e9436768c83d3f587a134bb0004fbafb6fdfb10bcb3e4e3f5' 
  AND token = 'M1L9dbj9b15uUhygh8BgvPaTdDSWWMiCclT4Tfi/v2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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