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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '044f8dfa06e83c5c03b9e177f16baf09f790283162a2a7aefc3991de1f47c9a2' 
  AND token = 'u1GqdyA5GlpWNijUxkhPdPsEmuhV9oSoEHfkuXg81dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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