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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a0c6e34ef7744365bfdcdb7cc3ae22770cd8c474a5837d27b6dcf621d18603a' 
  AND token = 'bfNSfTJsaMRQiuhW3bhiIH31KI5i6W1FNPdqdGeDXUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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