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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0993225c9e577677cd044601f9e7415831aa2fa005ec9015c23f76969f1c6a7e' 
  AND token = 'fhQndkWrMVKsLm16ixqNWlHb2HVvbfZKR8ZHrWBr1W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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