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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c00b3a8178f16f3a591daf113642d12a60e06b8c3e7a6972cc19abb16f832347' 
  AND token = 'I/xnaTB9lbVGbWIUQnoY5JI4ehaJigRCXezQhBM1Nx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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