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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29822072a434b51bb9b0609d98c0b5fdd947a6ab0822e53808f9e81ef3b9722c' 
  AND token = '5RzY7HlFFtfE+GhhPCchT+M7NXkD2xeBp1wiNpN4Gcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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