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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3cd1e522c3a166fa2953ca9c19ce077b33ba866629ebdeb109cccf633b381e3' 
  AND token = 'RpCJIjxwzzCFbqJ90O2vW6HjmCjaDFHm0wmrIKC33gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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