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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64c2abdf5ae0131a0c00bf207a3492c9c5a7ab80bfcd58cc4fa161b8f3a1e251' 
  AND token = 'u0BMfSdUuBB1Zsw6+nf6gJhb2UNGgmv+v4+vgRlW1nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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