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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbedff7a07dc512ae19fded6ade52de297527b561717746df434ba7a2f0640c0' 
  AND token = 'OLa9VVINfbVM4vV9Q4jY7UUjx+AiVOP5t7TmV/K4/hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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