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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf8f26dc4e1e28c326210160add2203d791792af010b6d95e3f613233d2d3ac5' 
  AND token = 'ebN/w6L1Zq2AnmvcBn9a9T5slGdEMMtL6OrsHNrGCCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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