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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca6d5955d2da315b6a527e58bd04b326ca2f29d106648f9a6b98798c03dbe00' 
  AND token = 'u26x8T6PCjov/3CdWliZvdoFia+96yYurhe5QsjNJ64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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