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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90aec6a4cab6edf08c22880724fcbd3042260091ff741b0838e6e603452fdc0e' 
  AND token = 'z/azKkRru0cJzffujnTpaWjV+kE/tLCgFyEXI8mqNv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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