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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7af8391fd38301cb1e582a30763784b4543f61e1823384bf1afa5e2cd1894ce1' 
  AND token = '86DjxaG0HRGaLQ8npW2sMUEeiz+19v8QJ3/R70Hw7Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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