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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a86f64cbfe6a242d8d0e6b63bddfbb8f315217ea8b2052c375b01029c73d19db' 
  AND token = '6G5U0Ob9FDldcA8I8yXfxhcdHXr1YBeRvi6WGeJcS0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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