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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb882c4cec30eb9db97e1fe5fb31c2a2bc122b139c5e40e8307e2b115477c5fa' 
  AND token = 'CHLZyxV7zIjOrjsBSALsqVJs3BzV9awDsv5j0O5ubZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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