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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deed9440cbf59ab8c6a2097880c3adf2e1103ec526b28ee6f237588eccd3f5ba' 
  AND token = 'hac1keLGZx3fi5n1KwIk77Nx6gdzybi2dWlyBfK5TUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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