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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0c3db628d93c8c681da7808d293d217072224e4eb9566cb307ded39c59ba23c' 
  AND token = 'cJaBamARfVPoFMjr96tikc2OFeeNQC90XbKrRPIUYcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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