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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbe9493dafabc30e2a572e8017abff2e8e9c3509c6460c87b3bec158cca73b5a' 
  AND token = '3Qx8KM6nSDc3DW5l1DdwsjnXxZ7z0nb+nEpoWUFOAxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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