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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a4a62d33e1b12c1e79f242127f0eba6537dc178b6e4543e75f349435a83562e' 
  AND token = 'R1sozAEgZ67ybxB0X/mWhr4N4IJ1t3WWCwXo8+497I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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